Signal and control system for elevators



Jan. 5, 1937.` E. M; BOUTON ET Al. 2,066,907 I SIGNAL AND CONTROL- SYSTEM FOR ELEVATORS Original File-d July 10, 1934 8 Sheefs-Sheet l ATT EY Jan. 5, 1937. E` M BOUTON T AL 2,066,907

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Original Filed July l0, 1934 8 SheetS-Sheet 2 Jam 5, 1937. E. MBOUTON ET Al. v 2,066,907

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Original Filed July l0, 1954 8 Sheets-Sheet 3 ULS B l/Pass 5* ar Buttons 4a C 46C 2f Zang Feea'ng Relays l l Harold' W w27/jams.

@I BY ATT NEY E. M. BOUTON ET Al. 2,066,907

Original Filed July 10, 1954 8 Sheets-Sheet 4 v a Q U INVENTORS. Edgarozzan E AT EY Jan. 5, 1937.

SIGNAL AND C ONTROL SYSTEM FOR ELEVATORS `Ian. 5, 1937. E M BOUTON ET AL A 2,066,907

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Original Filed July l0, 1954 8 Sheets-Sheet, 5

INV-ENTORS. v

WITNESSES:

Jan. 5, 1937. E. M. BOUTON ET AL smNAL AND CONTROL SYSTEM FOR ELEvAToRs Original Filed July l0, 1954 8 Sheets-Sheet 5 www.

WITNESSES;

Jan. 5, 1937. E. M. BOUTON ET Al.

SIGNAL AND CONTROL SYSTEM FOR ELEvAToRs Original Filed July lO, 1934 8 Sheets-Sheet '7 A M J 5 6 L M W. B M w. .L L 2 6 L 3. 2. 4. 3 u m. N .S d Y T 2 L E m @M6 B B/JU B B B B N N E ...M www m l5 w M. 5 L n MM E B uw. y www 2 @0. 3. .c @w1/win 3. gr c c 2. m i .Bwnf 31a .d WM w B E w YY W v. 2 2 3 MM@ s .w 2 w MN M M y w W W y 6 fw/:g5 y .y l.; 4 L y i H B j j H Comacts WITNESSES t Jan. 5, 1937. E. M. BOUTON ET AL SIGNAL AND CONTROL SYSTEM FOR ELEvAToRs Original Filed July lO, 1934 8 Sheets-Sheet 8 Herv?? Patented Jan. 5, 1937 UNITED STATES PATENT OFFICE SIGNAL AND CONTROL SYSTEM FORl ELEVATORS of Illinois Application July 10, 1934, Serial No. 734,498 Renewed September 24, 1935 25 Claims.

Our invention relates to signal and control systems for elevators, and more particularly to such signal and control systems as may be employed for operating a bank of elevator cars.

One object of our invention is to provide a signal and control system which will promote the answering of calls and the loading and unloading of passengers in the most prompt and ecient manner.

105 Another object is to provide, in an elevator system having individual stopping buttons for each car at each floor, for projecting the button corresponding to the nearest approaching car to indicate to the waiting passengers which button lc.- should be pressed to stop the nearest approaching car for the direction they desire to travel.

Another object is to provide, in an elevator systern having a stop push-button for each car for each direction at each floor, for withdrawing and rendering inoperative all of the push buttons at *U each oor except the push button for the nearest approaching car.

A further object is to provide an elevator signal and control system in which a car attendant in a car may ley-pass a stop signal and immediately transfer it to the next approaching car.

A further object is to provide a by-pass system which will immediately notify a waiting passenger when his stop signal is transferred to another car so that the passenger may at once move U' to the door for that car and be ready to board it when it arrives.

It is also an object to provide an elevator system in which a car attendant may by-pass floor stop signals and cause any floor stop signals J already registered to be immediately transferred to the next approaching car, at the same time extinguishing the lighted floor lanterns of the car making the transfer and immediately lighting the floor lanterns for the next approaching car at The noo-rs where stop signals are registered.

In order to accomplish these and other objects, we rave provided an elevator system embodying a group of cars and a signal and control system 45 therefor having the following characteristics and functions.

Each car in th-e vgroup may be started by means of an up starting and a down starting push button in the car and may be stopped by stop o push buttons in the car o-r by stop-signal push buttons at the iicor landings. Each car has its own stopping push buttons at the iioor landings; that a plurality of stop push buttons will be disposed at each floor, an up button and a down button for each car.

(C1. IS7- 29) Each button will be provided with means by which it may be withdrawn, that is, pulled into its casing, when the car to which it corresponds is not the nearest approaching car and the push button for the nearest approaching car will be projected or pushed out so that it will be noticed by the waiting passenger and may be operated by him to stop the nearest approaching car.

At any given time at any given oor only one up direction and one down direction button will be projected outwardly thereby indicating to the waiting passengers which buttonsare ready for operation for the purpose of stopping the nearest approaching cars in both directions.

The withdrawal and projection of the iloor push buttons will be controlled by the operation of the cars. Each car will cause the projecting of all of its own push buttons at the floors in advance of its motion up to the floor corresponding to the car ahead. The buttons for the other cars at these floors will be withdrawn out of position for operation.

When a car approaches a terminal which the car ahead of it has left, the approaching car will project its own push buttons not only at the oors between itself and the terminal but also its own push buttons away from the terminal tc the floor corresponding to the car ahead.

For a better understanding of our invention, reference may be had to the accompanying drawings, in which,

Figure l is a diagrammatic representation of an elevator installation embodying our improved signal and control system.

Fig. 2 is: an enlarged representation of the contact segments and cooperating Contact brushes on one of the floor selectors for one of the cars shown in Fig. 1, the brushes being shown in the position they assume when the car is stopped at the rst floor.

Fig. 3 is a view, partly in side elevation but mainly in cross section, of our improved push button structure embodied in the elevator system illustrated in Fig. l, with the push button in its normal position.

Fig. 4 is a View taken on the line IV-IV of Fig. 3.

Fig. 5 is a view similar to Fig. 3 with the push button in a projected position ready for operation by a waiting passenger.

Fig. 6 is also a View similar to Fig. 3 but showing a push button at the end of its operation by a waiting passenger.

Figs. '7, 8 and 9 collectively constitute a diagrammatic representation, in what is known as the straight line style, of the signal and control system embodied in operating the elevator cars shown in Fig. l; and

Figs. 7A, 8A and 9A collectively constitute an explanatory illustration of the relays embodied in Figs. '7, 8 and 9.

The illustration of the relays in Figs. 7A, 8A and 9A shows their coils and contact members disposed in horizontal alinement with their positions in the straight line circuits of Figs. 7, 8 and 9, so that the reader may readily determine the identification of any relay, the number and kind of its contact members and the position of its coil and its contact members in the straight line circuits.

For convenience in reading the drawings, Fig. 8 should be placed under Fig. 7, Fig. 9 under Fig. 8, Fig. 7A beside Fig. 7, Fig. 8A beside Fig. 8 and under Fig. 7A, and Fig. 9A beside Fig. 9 and under Fig. 8A.

Referring more particularly to the drawings, I have illustrated an elevator system embodying two cars A and B for serving five floors or landings. The cars are suitably suspended by cables II and I2 which pass over hoisting drums I5 and I6 respectively.

Although We have shown only two cars and a signal and control system therefor as applied to only live floors, it is to be understood that our invention may be used for any number of cars operating past any number of iloors.

For convenience, the main relays included in the system are designated as follows:

C=Stop push buttons in car A.

CC=Holding coils for the push buttons in car A.

D=Down direction switch for car A. E=Inductor relay for decelerating car A. F=Inductor relay for stopping car A. GzRelay for maintaining inductor relays for car A in operated condition. H=Relay for restoring inductor relays of car A.

J :Push buttons at oors. L=F1oor lanterns for indicating cars will stop. M=Coils for projecting floor push buttons. NzBy-passing relay for car A. P=Push button starting switch in car A. QzCancelling coils on the oor push buttons. R=Stop call registering coils on the floor push buttons. S=Car button stopping relay for car A. T=Floor button stopping relay for car A. U=Up direction switch for car A. V=High speed relay for car A. W=Up direction preference relay for car A. X=Down direction preference relay for car A. Y=Zone feeding relays for car A. Z=Zone relays common to both cars.

The relays for car B are given the same designation as those for car A with the letter B pre- Iixed thereto, the letters U and D indicate up and down direction. The prefix numerals indicate the floors and the sufx numerals indicate the contact members of the relays. For instance, the reference BZDJ means the floor push button J for car B for the down direction at the second floor, and the reference BZDJ I indicates one of the contact members of that push button.

Referring to the control system for car A as shown in Figs. 7 and 8, the hoisting drum I5 is directly coupled to an armature I1 of a suitable hoisting motor I8, the field winding I9 of which is connected, for constant voltage energization, to a source of supply designated by the supply conductors L+I and L-I.

A variable voltage system of control may be provided for operating the hoisting motor I8 wherein the armature Il is connected in a closed circuit with the armature 2I of a generator 22. The generator is provided with a separately excited field winding 23 and a cumulative series field winding 24. A resistor 24R is connected in the circuit of a separately excited field winding 23 for controlling the speed of the generator. The armature 2| of the generator may be driven by a suitable driving motor 25 which may be connected to a suitable source of supply, as represented by the conductors and switch 25.

A brake 5 operated by a brake magnet 6 is provided for applying a braking effect to the hoisting drum I5 when the car is brought to a stop, the brake magnet 6 being energized to release the brake 5 when the car is running and being deenergized to apply the brake 5 when the supply of power to the car is cut oil.

The direction` and speed of the hoisting motor I8 may be suitably controlled by controlling the direction and the value of the excitation current that is supplied to the separately excited eld winding 23 of the generator 22.

The direction of excitation current for the field winding 23 may be suitably controlled by means of an up direction switch U and a down direction switch D, while the Value of the current supplied to the field winding may be controlled by means of a high speed relay V which controls the resistor 24R.

The operation of the up direction and the down direction switches U and D, as well as the high speed relay V, may be controlled by means of an up push button UP and a down push button DP,that are mounted in the car in position to be actuated by the car attendant.

Any suitable means may be employed for automatically stopping the car A level with the oor it serves. As an example of such means, I have illustrated an automatic inductor relay landing system similar to that disclosed in Patent No. 1,884,446, issued October 25, 1932 to K. M. White and G. K. Hearn. and assigned to the Westinghouse Electric Elevator Company.

The landing system for car A includes a decelerating inductor relay E and a stopping inductor relay F for causing the car to be automatically decelerated from its high speed and brought to a stop at an exact level with the floor. The decelerating inductor relay E is mounted on the car A in position to cooperate with an inductor plate UE for the up direction and an inductor plate DE for the down direction. The stopping inductor relay F is mounted on the car A in position to cooperate with an inductor plate UF for the up direction and an inductor plate DF .for the down direction. The inductor plates are constructed of magnetic material and are mounted in the hatchway in such position as to cooperate with and open the contact members of the inductor relays on the car when the relays are in an energized condition as the car approaches a stop at a landing.

For simplicity, only one set of inductor plates for one floor have been shown, but it will be understood that a set similar to that shown may be provided for each floor served by the car intermediate the upper terminal landing and the lower terminal landing. If desired, a set of inductor plates corresponding to the inductor plates UE and UF may be provided for the upper terminal oor and a set corresponding to inductor plates DE and DF may be provided for the lower terminal floor.

As shown, each inductor relay is provided with two sets of contact members. For an up stop, the contact members El of the relay E cooperate with the inductor plate UE in deceierating the car, and the contact members Fi cooperate with the inductor plate UF in stopping the car aiter it is decelerated. For the down direction, the contact members E?, of relay E cooperate with the inductor plate DE to decelerate the car and the contact members F2 cooperate with the inducto-r plate DF in stopping the car.

The contact members of the inductor relays just described are so connected with the car control circuits that, when the inductor relays are energized to decelerate and stop the car at the floor represented by the inductor plates in the down direction, the contact members E2 pass the inductor plate DE and are thereby opened to decelerate the car, and as the contact members F2 come opposite the inductor plate DF they open to stop the car level with the floor. The contact members El of relay E and the contact members Fi oi the reiay F are opened by the inductor plates UE and UF' respectively when the stop is to be made in the up direction.

The inductor relays are oi the self-holding type, that is, when they are energized but have not yet come opposite an inductor plate, the contact members remain closed, but when the relay comes opposite an inductor plate, the contact members adjacent that plate move to an open position and are held in such open position until the inductor relay is deenergized. The means for holding the contact members in the open position on inductor relay E, for instance, are the extended portions 28 and 29 (Fig. l).

For instance, it will be seen that when the inductor relay E passes the down inductor plate DE in an energized condition, the contact members E2 will be opened, and the arm 29a will be moved upwardly to such a position that they would be attracted and held by the magnetized projection 2Q. Therefore, the opened Contact members remain open and do not reclose aiter passing the inductor plate to complicate the operation oi the control system. However, we do not desire to be limited to indue-tor relays oi this particular type because inductor relays with temporary opening contact members which are well known in the art may be employed just as readily if the motor control system is adjusted to cooperate with them.

When the inductor relays are energized to slow down the car to a stop, it is desired to maintain them in that condition until they are operated to bring the car to rest. A slow down holding relay G is provided for this purpose.

When the induotor relays are energized for a stop, they remain energized until restored even though their contact members are operated by passage near the inductor plates. Therefore, an inductor restoring relay H is provided for deenergizing the inductor relays of car A after a stop has been made and also for so interlocking them that they can be energized only while the car is moving.

lin the elevator system illustrated in the drawings the energization of the inductor relays on car A for decelerating and stopping that car at a floor is effected either by a car button stopping relay S or by a floor button stopping relay T. The energization oi either of these relays will, as the car nears a floor at which a stop is to be made,

energize the inductor relays on that oar and thereby cause it to decelerate and stop at that floor.

The car button stopping relay CS is controlled by a plurality of push buttons in the car, one for each floor. The pressing of a car button by a car attendant will register a stop call, or in other words, initiate and maintain a circuit which will be completed as the car arrives within a predetermined distance of the iloor corresponding to the button and thereby energize the stopping relay S which will, in turn, energize the inductor relays to stop the car at that iioor. n this manner, the car may be stopped at any door by pressing the push button in the car for that floor.

The push buttons mounted in car A for operation by the car attendant when he desires to register stop calls to stop the car at the oors Where passengers desire to get off, are designated as 2C, 3C and dC' for the second, third and fourth loors, respectively, no buttons being necessary for the lower terminal floor and the upper terminal floor because the car may be stopped by the usual well-known limit switches (not shown) as it approaches these terminals,

Associated with the respective car push buttons are car push-button holding or registering coils 2CC, 3CC and QCC. These coils operate to hold the car push buttons in a depressed position after they are pressed by the car attendant in making stops from within the car. The coils are deenergized when the car reaches the terminals to release the buttons for the next direction of operation.

The stop car push buttons in car B are designated as B2C, B30 and B-'iC and the holding coils therefor are designated as BZCC, B3CC and BdCC.

The floor button stopping relay T is controlled by a plurality of push buttons at the oor landings, for each direction for each car at each oor landing. The pressing of a push button at a floor for a car will register, or, in other words, initiate and maintain a circuit which will be completed as that car nears that iioor and thereby energize its stopping relay T to energize the inductor relays to stop the car at such door.

The push buttons disposed at the floor landings to enable waiting passengers to stop the cars are designated as follows: The up buttons for car A are marked iUJ, EUJ, BUJ and 4UJ for the rst, second, third and fourth floors; the down buttons are marked DJ, liDJ, 3DG and ZDJ for the rth, fourth, third and second floors. For car B, the up buttons at the first, second, third and fourth iioors are marked BiUJ, BEUJ, BUJ and BtUJ; and the down buttons at the fifth, fourth, third and second oors are marked B5DJ, BiDJ, BSDJ and BZDJ, Inasmuch as the cars do not go below the rst floor, no down buttons are provided for the i'irst floor. Similarly, inasmuch as the cars do not go above the fifth hoor, no up buttons are provided for the fth iloor.

As shown in Figs. 3, ll, 5 and 6, we have provided a novel push button structure for each of the push buttons J at the door landings. As shown, this structure is housed within a supporting body and a bearing plate il mounted upon face plate i2 by a piurality of screws 43.

The body iii sup-ports a slide-ble frame lill provided with a head and a central partition or wall dh. The legs of the frame extend through apertures lili in the rear portion oi the body 40 thereby supporting and guiding the movements of the frame within the body.

The outward movement of the frame is limited by movement of its head against the bearing plate 4I; inward movement is limited by the engagement of the wall 46 with the rear portion of the body 40. A coiled compression spring 50 is disposed between the head 45 and the bearing plate 4l to bias the slidable frame 44 toward its innermost position in the body 40. Hence, the Trame will normally remain in its innermost position in the body unless it is forced outwardly against the biasing eiect of the spring 5D.

The push button J is slidably mounted in and supported by the sliding frame and comprises a button or cap 5i mounted on the outer end of a shaft 52 by means of a pin 53. The button is slidably seated in a depression 54 in the face plate and its shaft 52 extends inwardly through the bearing plate 4l, the compression spring 5D, the frame head 45, frame wall 46 to the wall 6B of the body.

The slender portion of the shaft 52 is slidably seated in the central portion of the head 45 and s the rear end of the shaft is slidably seated and supported in the central portion of the partition or wall 46 to permit the push button to move inwardly and outwardly in the frame 44.

In order to bias the push button to an out position in the frame 44, a compression spring 56 is concentrically positioned on the shaft 52 between the wall 46 and a washer 51 fdrmly fixed to the shaft. The outer movement of the push button relative to the frame under the effect of the biasingr spring 56 is limited by an insulating sleeve 58 mounted upon and firmly aflixed to the central portion of the shaft 52 in position to impinge against the head 45 on the frame. The inner movement of the push button relative to the frame is limited by the spring 56 and the washer 5l. Hence, if the frame is moved outwardly to the position shown in Fig. 5 it will carry the push button with it and hold it in such position that it can be pressed inwardly against the operation of the biasing spring 56 by nger pressure as shown in Fig. 6.

A pair of contact members J l and J2 are mounted upon the push button for closing certain control circuits when the push button is moved inwardly in the sliding frame. The contact member J l comprises a conducting bar 60 and individual contact members 6l and 62. The conducting bar 60 is provided with a large central portion which passes around and isfirmly aixed to the push button as by riveting it to the insulating collar 58. The individual contact members El and 62 are firmly mounted in the side walls of the frame 44 in position to be engaged by the conducting bar 6D when the push button is moved inwardly relative to the frame, as shown in Fig. G. The contact members J2 are similar to the contact members J I.

In order to eiTect an outward movement of the sliding frame 44 and carry with it the push button J, an armature 64 is seciued by suitable screws 65 to the inner end of the sliding frame 44 in position to cooperate with an electromagnetic coil M mounted in a casing 66 disposed on the lower end of the body 40. The coil M is held in position against a partition wall 68 in the casing 66 by a suitable plate 10 fastened thereto by a plurality of screws 1i. By reason of the position ol the coil M and the armature 64, it will be :een that energization of the coil will attract the armature 64 and thereby move outwardly the sliding frame 44 against the biasing effect of the spring 5i). When the sliding frame 44 is thus moved outwardly, it carries with it the push button J by reason of the biasing effect of the spring 56 upon the push button shaft 52. Thus, when the coil M is energized, the push button J is projected beyond the face plate 42 in position ready for operation as shown in Fig. 5. Also, the magnetic force exerted upon the armature B4 is stronger than the force exerted upon the push button by the spring 56. Therefore, when pressure of a linger is applied to the push button, the spring 56 is overcome and the button moves inwardly until it closes the contact members J I and J 2.

For reasons to be explained later, it is desirable to have the armature 64 released very slowly. Therefore, a suitable damping device such as a copper collar 14 is firmly aiiixed to the inner end of the armature 64. When the coil M is deenergized, the iniiuence of the copper collar 'i4 will cause the armature 64 to be released slowly as the magnetic effect drops away and the eilect of the biasing spring 5D causes the sliding frame 44 to retire to its normal position.

When the push button is pressed inwardly by a waiting passenger as shown in Fig. 6 it is desirable to have some means to hold the push button in its depressed position. For this purpose, we have provided an electromagnetic coil R mounted in the casing 66 in position to attract and hold the enlarged portion 'I3 of the shaft 52 when the push button is depressed to close a self-holding circuit. This holding coil R will be called the call registering coil.

In order to release the push button after it is depressed and held in by the registering coil R, we have provided a cancelling coil Q which, when energized, counteracts the effects of the registering coil R and permits the push button J to move outwardly in the sliding frame under the pressure exerted by the biasing spring 56.

Inasmuch as each car has its own up button and its own down button at each floor, we have provided for informing the waiting passenger which button should be pressed to stop the nearest approaching car in the direction which he desires to go, by projecting the :door push button corresponding to said nearest appreaching car. sires to go to an upper iloor, he will press the only projecting up button. Thereby the passenger will stop the nearest approaching car going up, Likewise, if the passenger desires to go to a lower floor, he will press the only projecting button for the down direction and thereby stop the nearest approaching down car. The buttons at any floor for all the cars except the nearest approaching car are withdrawn out of position for operation by the waiting passenger and are rendered inoperative, and only the projecting buttons at a floor may be effectively operated by waiting passengers to stop the nearest approaching car in the up and in the down directions.

In order that a waiting passenger may be informed or signalled after he presses a projecting licor push button that his stop call has been registered and also which cai1 approaching in the direction he desires to go will stop for him, we have provided a plurality of signals or indicating devices, preferably electric lamps, which are mounted at the hatchway doors at the floor landings and which are commonly known as floor lanterns.

Each of the top and bottom iloors is provided Hence, when a passenger devwith a single signal lamp or oor lantern for each car, but each of the intermediate floors is provided with a pair of lanterns for each car, one serving to indicate that the corresponding car is approaching in the down direction and will make a down stop at the floor, and the other that it is approaching in an up direction and Will make an up stop.

The floor `lanterns for car A (Fig. 7) are designated IUL, ZUL, SUL and 4UL for the up direction at the first, second, third and fourth floors and 5DL, 4DL, 3DL and 2DL for the down direction at the fifth, fourth, third and second floors.

For car B (Fig. 9), the up floor lanterns are designated as BIUL, BZUL, B3UL and BdUL for the first, second, third and fourth floors and the down lanterns as B5DL, BliDL, BSDI.. and BZDL for the fifth, fourth, third and second iioors.

When a passenger presses a projecting floor button, the oor lantern for the nearest approaching car in the direction he desires to go is lighted immediately to indicate to him that that car will stop for him and the hatchway door at which it will stop, so that he may at once walk to that hatchway door and be ready to enter the car as soon as the door opens.

The floor buttons for any car are in a projected condition only at the iioors being approached by that car up to the oor corresponding to the car ahead. In other words, each car provides ahead of itself a signal zone defined by its projected push buttons, to indicate to the waiting passengers at the oors in that Zone which push buttons should be operated to stop the nearest approaching car.

In order to provide the zones for the cars and project the push buttons therein, we have provided a plurality of zone relays designated as IUZ, 2UZ, SUZ and 4UZ for the up direction and 5DZ, ADZ, 3DZ and 2DZ for the down direction. The zoning relays are common to both cars and divide the complete round trip shaft travel of all the ears into as many signal Zones as there are cars operating.

In order to energize the Zon-e relays and feed the Zone circuits set up by the zone relays, we have provided a plurality of zone feeding relays, the up Zone feeding relays for car A are designated as IUY, 2U'Y, 3UY and liUY for the first, second, third and fourth floors. The down zone feeding relays for car A are designated as EDY, 4DY, 3DY and 2DY for the fth, fourth, third and second floors. Car B isfprovided with similar zone feeding relays having similar designations with the letter B preceding to indicate that they are for car B.

The Zone feeding relays are operated in accordance with the position of the cars. Therefore, they not only energize the zone relays and feed the zone circuits but they also assign the Zones to the cars. The Zone assigned to any one car is the Zone in advance of that cars motion. The

zone for each car is elastic and keeps moving vator system, a car may be so loaded that the operator may desire to run past the outside stop calls for various floors. To permit this operation, a by-pass push-button (Fig. 7) is mounted in car A and a similar by-pass push button B15 is mounted in car B. As long as a car attendant presses the by-pass button in his car, that car will not answer or stop at any floor button call, it will not project its own push buttons in its own zone, and it will prevent registration of stop calls on its floor buttons while by-passing. As soon as the by-pass button is released, the car. will again respond to outside calls, project its push buttons, etc.

A by-pass relay N is provided for energization by the pressing of the by-pass button 15 in car A to so modify the control circuits as to effect the various functions described in the by-passing of car A. Similarly, a by-pass relay BN is provided for energization by the pressing of the by-pass button B15 in car B.

When an attendant presses the by-pass button and thereby causes his car to pass a registered floor call without stopping, it is desirable to have such registered floor call transferred immediately to` the next following car. In our system this transfer is effected by the operation of the transfer relays, the zone relays and the zone feeding relays. The Zone feeding relays for the transferring car are disconnected from operation by the transfer relay of that car. Therefore, the next following car, in operating its zone feeding relays and consequently the Zone relays, causes its zone circuit to include the Zone circuit of the transferring car, thus effecting the immediate transfer of any registered stop signal which has been by-passed.

In order that the various circuits for the push buttons, floor lanterns, relays, etc., may be connected in accordance with the position of the cars with respect to the floors past which they operate, the car A is provided with a floor selector SE and the car B with a floor selector BSE. The oor selectors may be of any suitable type such as are usually employed in elevator systems and may be located at any suitable point such, for example, as in the pent house or in the elevator shafts.

The floor selector SE for car A is provided with a set of up contact segments and a set of down contact segments as shown in Fig. 2, which are arranged according to the fioors and are disposed to be engaged by cooperating oontact brushes to 39, inclusive, mounted upon and insulated from a movable arm SM.

The movable arm SM is operated in accordance with the movements of the car A by means of a screw shaft 11 driven by some part of the operating mechanism of the car. The frictional engagement between the arm SM and its operating screw 'l1 will cause the arm to bear against the up contact segments when the car is travelling upwardly and against the down contact segments when the car is travelling downwardly, it being understood that the arm will tilt from one position to the other when the direction of operation of the car is reversed. For a more complete detailed description ofthe type of floor selector here shown, reference may be had to the Smalley and Reiners Patent 634,220 of October 3, 1899.

However, in the present system when the car is at a terminal, it is desirable Ato have the arm SM tilt to the vopposite direction as soon as the car is conditioned to travel in that direction, without Waiting until the car actually begins to move. For this purpose, each iioor selector is provided with a pair of electromagnets which tilt the floor selector arm to the up direction when the car is at the lower terminal upon closure of the cars up switch, and to tilt the selector arm to the down direction when the car is at the upper terminal upon closure of the cars down switch. The electromagnets on the floor selector SE (Fig. 1) for car A are designated as I3 for the up direction and I4 for the down direction.

The group of up contact segments designated as a under the up brush 30 are energized by the pressing of the car buttons so that the approach of the car to a floor for which a car button has been pressed will cause the energization of the car button stopping relay and thereby eiect the stopping of the car at that floor.

'I'he group of up contact segments designated as b` under the up brush 3l are energized when stop calls are registered on the floor buttons for the purpose of energizing the floor button stopping relay to stop the car on its up trip when it approaches a floor at which an up stop is to be made in response to a stop signal on the floor buttons.

The group of contact segments designated as c under the brush 32 are energized to light the up licor lanterns for car A at the floors at which that car stops on its up trip.

The group of up contact segments designated as d under the brush 33 serves to so connect the circuits to the zone feeding relays as to energize these relays in accordance with the position of the car.

The group of up contact segments designated as e under the brush 34 completes the circuits for canceling registered stop calls at the floor landings.

The contact segments on the down side of the floor selector are engaged by the brushes 35 to 3S, inclusive, when the car is descending and co1"- respond to the contact segments just described for the up direction, those marked f being the down car button stop segments; g the down iioor button stop segments; h the down floor call cancelling segments; i the down zone feeding relay segments; j the down oor stop call cancelling segments.

Inasmuch as the length of the contact segments and the sizes of the brushes will vary in accordance with the diiierence between the floor, speed of cars, etc., in different installations, it is impossible to give the exact dimensions of such segments and brushes in this application. However, with the aid of the illustration given in Fig. 2, any one familiar with the elevator art will be able to arrange the contact segments and brushes on the floor selector to suit any particular installation, after he has ascertained the characteristics of the system.

It should also be noted that, while the iioor selector arm SM is being tilted, the circuits for the zone feeding relays should not be opened. Therefore, the brushes 33 and 3B should be so mounted and supported on the arm that one will be engaged before the other is disengaged from its contact segments when the arm tilts.

Furthermore, each of the brushes 33 and 38 is of such length that it spans the opening between adjacent contact segments in moving up or down, in order to prevent momentary deenergization of the zone feeding relays.

Instead of contact segments and push buttons for stopping the cars at the terminal oors, we

have, for the sake of simplifying the drawings and description assumed that the cars will be stopped at such terminal floors by the customary limit switches. Inasmuch as such limit switches are old and well known in the elevator art, it has been deemed unnecessary to illustrate and describe the same.

The invention may be understood best by an assumed operation of the system illustrated in the drawings.

It will be assumed that car A is standing at the lower terminal, that car B is standing at the upper terminal and that both cars have their doors open.

The switches 26 and 21 (Fig. 7 are closed to start the motor generator sets of the cars A and B and to prepare the control system for operation.

It will be assumed that the attendant in car A at the lower terminal pressed the up direction push button UP to prepare the car for an up trip. The operation of the button UP opens its contact members UP2 to deenergize the down direction relay X which thereupon closes its contact members XI, thus energizing the up direction preference relay by a circuit extending from the supply conductor L-l-I through the contact members DP2 of the push button DP, the coil of relay W, the contact members XI and the contact members of limit switch ULS to supply conductor L I.

The energization of the up direction relay W closes its contact members W2 thereby energizing the car button holding coils ZCC, 3CC and lICC by a circuit extending from the supply conductor L+ through the coils named and the contact members W2 to the supply conductor L-I (Fig. 7). If any of the stop buttons in the car are pressed by the car attendant during the up trip they will be held in their operated condition by the energized holding coils until the car reaches the upper terminal or the direction of its .operation is changed.

When the up direction preference coil W is energized by the closing 0f the contact members XI the electromagnet I3, in parallel with the coil W, is energized to tilt the arm SM of the floor selector from its down position to its up position, thereby causing the up brushes to engage the up contact segments for car A.

Inasmuch as car A is standing at the first floor with the high speed relay V deenergized and the brush 32 of the floor selector on the contact segment Ic, the up floor lantern IUL for car A at the lower terminal is lighted by a circuit extending from the supply conductor L-I-2 through the contact members V2, brush 32, contact segment Ic and iioor lantern IUL to the supply conductor L-2.

The car is now ready for an up trip and it will be assumed that a waiting passenger enters the car and requests a stop at the third floor. Thereupon, the attendant presses the stop push button 3C for the third floor. Inasmuch as the coil 3CC has been energized as previously described, the button 3C is held in by its holding coil and the stop call for the third iioor is thereby registered. The closing of the contact members of the push button 3C completes a circuit for energizing the up stopping segment 3a for the third floor.

It will be assumed that the car attendant now closes the door for the up trip. Inasmuch as the up push button switch UP has already been closed and the closing of the door closes the door contact members 18, the up direction switch U is energized by a circuit extending from the supply cars into two signal zones, one for car A and one for car B. The zone for car A extends from the lower floor up to the upper terminal and all of the up buttons for oar A at the floors between oar A and car B are projected ready for operation by intending passengers. The up buttons for car B at the floors between car B and car A are withdrawn and rendered inoperative by the zone system. In the zone for car B, the down push buttons B4DJ, B3DJ and BZDJ for car B at the fourth, third and second floors and the up button BIUJ for car A at the low-er terminal are projected ready for operation by intending passengers, and the down iioor buttons fiDJ, SDJ and 2DJ` for car A are held in their inoperative position.

The waiting passenger at the second iloor who desires to go up will notice the projecting up button for car A and operate it to stop the next approaching car in the up direction. Ii a passenger at the second floor desires to go down, he will notice the projecting down push button for car B and will operate that button to stop the next approaching car for the down direction.

It may be noted that all the floor push buttons are normally heid in their withdrawn position by the biasing springs 5i! and that it is only when their projecting coils M are energized by the zoning system that the correct buttons are projected for operation.

The projection oi the iioor buttons lfor car A is effected because the active portion 92 of the zone ring circuit 8U lying between the open contact members IUZ! and 5DZI and fed by the closed contact members IUYI includes the coils ZUM, 3UM, 4UM and 5DM for projecting the up floor buttons 2UJ, 3UJ and 4UJ at the second, third and fourth floors and the down floor button EDJ at the fifth iioor for car A. it wiil be noticed that the inactive portion 93 of the ring circuit Bi) which includes the closed contact members 2DZi, 3DZI and 4DZI is not fed by any zone feeding relay, that is, it is not connected by ciosed contact members to the supply conductor L-|.

By referring to Fig. 3, it wiil be seen that when the projection coil M of any one of the push buttons is energized, it pulls the armature 64 and thereby causes the sliding frame M to carry the push button J out of its recess in the face plate 62 and present it for operation by the waiting passengers, as shown in Fig. 5. Inasmuch as the projection coils M for the down iiocr push buttons at the fourth, third and second floors and for the up floor push button at the iirst floor for car A are not energized, the biasing springs 53 thereof cause the push buttons J to be held in their inoperative positions.

Referring now to the zone ring circuit B20 (Fig. 9) for car B, it will be noted that the active portion 9| of the circuit between thc open contact members IUZZ and SDZZ and including the contact members 2DZ2, SDZR and D22 is fed by the closed contact members BEDYZ, and that consequently the projecting coils BADM, B3DM, BZDM and BIUM are energized to project the down push buttons B/ZDJ, BSDJ, and B2DJ at the fourth, third and second floors and the up button BIUJ at the first iioor for car B.

As car A moves up to the third floor, its contact 33 moves from contact segment ld to ccntact segment 2d, thereby changing the length of the zone system for cars A and B as follows: The position of brush 33 on contact segment 2d energizes the zone feeding relay ZUY and deenergizes the zone feeding relay IUY. The energization of relay 2UY closes its contact members E3 (Fig. 7), and

At the same time the brush having left the contact segment ifi has deenergized the zone feeding relay IUY, thereby opening its contact members IUYI for feeding the active portion ol the zone ring circuit 8U, and has opened its contact members IUYE, thereby deenergizing the conc relay lUZ, which in turn closes its contact members lUZi in the ring circuit and its contact members |UZ2 in the ring circuit B80. An examination of the ring circuits now discloses that the energized portion 92 of the ring circuit 80 extends from the open contact members ZUZI through the closed contact members SUZI and 4UZI to the open contact members DZi and that this portion of the ring zone circuit is led by the closed contact members ZUYI therefore, the button projecting coils BUM, 4UM and 5DM are energized to project the up buttons 3UJ and dUJ at the third and fourth floors and the down button 5DJ at the fth floor for car A.

Referring now to the ring circuit B36 lor car B, We find that the open contact members 2UZ2 and 5DZ2 cause the active portion 9i of the circuit to extend from the contact members 2UZ2 through the contact members IUZ2, 2DZ2, 3DZ2 and 4DZ2 to the open contact members 5DZ2 and that this portion 9| of the ring circuit B8B is fed by the closed contact members BEDYL. Therefore, the projecting coils BADM, BSDM, BZDM, BIUM and BZUM are energized to project the down floor buttons B4DJ, BSDJ and B2DJ for car B at the fourth, third and second 'floors and the up iioor buttons BIUJ and BQUJ for car B at the first and second floors.

As car A moves from the second iioor to the third floor, the contact brush 33 nieves from Ythe contact segment 2d to the contact segment .'irl, thereby deenergizing the zone feeding relay E'UY and energizing the zone feeding relay SUT. Consequently, the active portion 92 of the ring eircuit B is fed by the closed contact members EUYI instead oi 2UYI, and the contact members SUZI are opened and the contact members 2UZi are closed.

The active portion 92 of the ring circuit 90 now extends from the open contact members BUZI through the closed contact members U2/il to the open contact members EDZI. This activo portion of the circuit 80 is fed by the closed contact members 3UYI; therefore, the projecting coil 4UM is energized to project the up fioor button 4UJ for car A at the fourth door.

The energization of the zone relay TZUZ and the deenergization of the zone relay RUZ also changes the active portion Si of the ring circuit nog. 9) ,because the contact members 3UZ2 opened and the contact members ZUZZ are closed in that circuit. The active portion 9! of the circuit B80 now extends from the open contact members 3UZ2 through closed contact members 2UZ2, IUZ2, 2DZ2, 3DZ2, and 4DZ2 to the open contact members EDZZ. Inasmuch as this active portion of the circuit is still fed by the closed contact members 5DY2, the up buttons BIUJ, BZUJ and BSUJ at the first, second and third floors and the down buttons BADJ, BBDJ and B2DJ at the fourth, third and second floors lor car B are projected by the energization of the uA projecting coils BSUM, BZUM, BIUM, BZDM, BSDM and B4DM.

It may be noted here that although car A is standing at the third iioor on an up trip, ready to move upwardly, the up floor button BSUJ for car B at that iioor is projected. However, it should be noted that inasmuch as car A is standing at the third floor, the high speed relay for car A is deenergized thus closing its contact members V4 (Fig. 8) and thereby preparing a circuit which will be completed through the deenergizing coil B3UQ, if the button BSUJ is pressed. If this projecting button is pressed, it Will simply complete a cancellation circuit extending from the supply conductor L-1-3 through the contact segment 3e, brush 34, and the contact members V4 to the supply conductor L-3. Therefore, any effort to register a stop call on this button will be ineffectual because it would energize a cancellation coil at the same time it energized a registering coil.

From the foregoing description, it will be seen that the zone of projecting push buttons for each car travels with that car and extends in front of that car up to the next car ahread. It will also be seen that the zones travel along with the cars and that a zone may extend away from a terminal as well as toward a terminal when neither of the cars defining the zone is at the terminal. In other words, the zone system extends around the corner when no car is at the terminal and is not limited only to the direction in which the car is physically moving.

It will be assumed now that a waiting passenger, standing at the second floor landing, desires to make a down trip. As previously described, the down push button ZDJ at the second floor for car A is normally withdrawn and the zone system has operated to project the down push button BZDJ for car B at that floor. Therefore, the waiting passenger will observe the projecting push button BZDJ and, being desirous of going down, will operate that push button to stop the nearest approaching down car.

The closing of the push button BZDJ complctes a` circuit for energizing the stop call registering coil BZDR by a circuit extending from the supply conductor L|3 through the contact members of button BQDJ, the coil BZDR and conductors 8| and 82 to the supply conductor L-S. As shown in Fig. 6, the energization of the registering coil R holds the operated push button in` in its pressed position. In this position, its contact members J I are closed, thus completing a selfnholding circuit.

'Ihe operation of the push button BZDJ also closes its contact members BEDJ l (Fig. 9) thereby lighting immediately the down floor lantern BZDL for car B at the second i'loor, by a circuit extending from the supply conductor L+6 through the Contact members B2DJ2 and the lamp BZDL to the supply conductor L-G. Thus, it is seen that, as soon as the waiting passenger presses a push button to stop the nearest approaching car, he at once receives a signal by way of the lighting of a floor lantern telling him that a car will stop for him and at which door it will stop so that he may immediately step to that door and be readyto enter the car as soon as the door opens.

The closing of the contact members BIZDJZ also energizes the contact segment BZg so that, when car B comes within a predetermined distance of the second floor, the Contact brush B35 will strike this energized segment and, through a sequence of relays, be operated to stop car B at the second floor.

As previously described, car B is standing at the upper terminal ready to make a down trip.

Therefore, its down direction preference relay v BX is energized by a circuit extending from supply conductor L-1-5 (Fig. 9) through the contact members BUP2 of up direction button BUP, the coil BX and the contact members BWI and BDLS to the supply conductor L-5. The energization of the relay BX closes its Contact members BXE thereby energizing the car button holding coils BECC, BECC and BllCC so that if the car attendant presses any car button on the down trip, that button will be held in its pressed position. by its corresponding holding coil until the car reaches the lower terminal.

The energization of the down direction switch BX also causes the energization of the electromagnet BM in parallel therewith to tilt the floor selector arm BSM to its down direction position. in this position, the iioor lantern brush B31 is disposed on the floor lantern segment B5h and, inasmuch as the high speed relay BV for -car B is not yet energized, its contact members BV3 are closed and cause the lighting of the down floor lantern BEDL for car B at the upper terminal, by a circuit extending from the supply conductor L-i-G through the contact members BV3, brush B37, contact segment B511 and the floor lantern B5DL to the supply conductor L-G.

It will be assumed that the attendant in car B at the upper terminal now proceeds to move the car downwardly by closing the door and pressing the down starting push button BDP in the car. The closing of the door (not shown) closes the door contact members B18.

The closing of the start button contact members BDI-I energizes the down direction switch BV by a circuit extending from the supply conductor L+5, through the contact members BDPi, the coil BD, the contact members BIM, BFI and B78 to the supply conductor L-5.

The energization of the switch BD closes its contact members BDLl to provide a self-holding circuit for itself.

The energization of the switch BD also closes its contact members BDI, BD2 and BDS to complete circuits for energizing the auxiliary generator field winding B23 and the brake magnet BE. The circuit for the auxiliary field Winding extends from the supply conductor L-lthrough the contact members BD2, the winding B23, the contact members BDI and the resistor B24R to the supply conductor L-B. The circuit for the brake magnet Bti extends from the supply conductor Irl-5 through the contact members BDS and the coil B6 to the supply conductor L-5.

The energization` of the eld winding B23 and the release of the brake 5 by the energized brake magnet B6 causes the car to start downwardly.

The closing of the contact members BD6 of the energized switch BD energizes the high speed relay BV to close its contact members BVZ, thereby short-circuiting the resistor B241?, and thus causing the car to operate at its normal high speed.

The energization of the high speed relay BV causes it to open its contact members BVI. thereby extinguishing the down floor lantern SDL for car B at the Lipper terminal.

The closing of the contact members BDS of the relay BD also energizes the relay BH to close its Contact members BHI for restoring the inductor relays of car B so that they may be again energized to stop the car when desired.

It will be assumed that as car B moves downwardly in its shaft, the attendant, desirous of running the car to the first iioor Without taking on additional passengers, presses the by-pass or transfer push button B15 in car B and maintains it in a pressed condition until his car arrives at the lower terminal. The operation of the push button B15 energizes the by-pass relay by a circuit extending from the supply conductor L-l-5 through the contact members of button B15 and the coil BN to the supply conductor L-5. This operation at once transfers the registered down stop call at the second floor from car B to car A by extinguishing the signal lantern of car B at the second floor, by immediately lighting the down signal lantern of car A at the second floor, by so changing the system that the heretofore projecting push buttons for car B are Withdrawn and only the push buttons of car A are projected at the various floors for operation by the waiting passengers, by deenergizing the down stopping segment B2g of car B so that it will not stop car B at the second floor and by energizing the down stopping contact segment 2g for car A so that it will stop car A at the second floor.

The energization of the by-passing relay BN opens its contact members BNI in the circuit connecting the floor button stopping relay BT to the supply conductor L-S (Fig. 9), and thereby renders the relay BT inoperative and thus pre vents the stopping of car B at the second floor in response to a registered call on its iloor push button at the second floor. This does not affect the stop push buttons in the car, and if the car attendant desires to press the car stop push button for the second Iioor or any other floor, car B will stop in response thereto.

The energization of the transfer relay BN also opens its contact members BNZ in the circuit connecting the brushes B3B and B33 to the supply conductor L-S, thereby deenergicing the zone feeding relays for car B and rendering them incapable of energization until the by-pass button B15 is released by the car attendant. Inasmuch as the zone feeding relays 2DY, etc., for car B are deenergized, none of the zone relays IUZ, etc., (Fig. 8) are energized thereby. Therefore, the only zone relays energized during the by-passing operation of car B are the zone relays energized by the operation of the zone feeding relays of car A.

As previously described, with car A standing at the third iloor on an up trip, its brush 33 is on the contact segment 3d, thus energizing the zone feeding relay BUY.

The energization of the zone feeding relay BUY closes its contact members BUYI, thus energizing the zone feeding relay 3UZ to open its contact members 3UZI in the ring circuit 8) (Fig. 7) and its contact members 2UZ2 in the ring circuit B() (Fig. 9), as previously described. Also, the closing of the contact members BUYI of the zone feeding relay lUY provides a feeding connectlon for the zone ring circuit 8U to the supply conductor L-L Inasmuch as only the contact members BUZI in the zone ring circuit 50 are open and the closed contact members BUY! provide a feed circuit for that ring circuit, all of the up projecting coils IUM, etc., and all the down projecting COilS SDM, etc., for car A are energized to p1 'oject the floor push buttons for car A. Hence, the zone of projected buttons for car A not only extends up but also down its shaft.

Referring again to car B, during its by-passing stage it does not energize any zone feeding relays nor zone relays. Therefore, the only open contact members in the zone ring circuit B for car B are the contact members BUZZ of the zone relay operated by car A, but no zone feeding relay contact members are closed in connection with this circuit to provide a .feed therefor. Therefore, none of the licor projecting coils BIUM, etc., are energized for car B and no floor buttons are projected for car B.

By referring to Fig. 3, it will be noted that when the down step call at the second floor was registered on push button BTU, thfl operation of that button not only completed a call registering circuit through the registering coil B'ZDR of the push button for car B but also completed a circuit through the registering coil 2DR for the push button 2DJ of car A.

However, even though the closing of the floor button BZDJ energized the registering coil 2DR of the floor button tDJ for car A at the second lioor and thereby effected a magnetic pull upon the armature portion 13 of the button iiDJ, as will be seen by Fig. 3, it will be noted that this condition does not yet effect a closure of its contact members EDJ l and TIDJ?. because the sliding frame 44 is still in its rearmost position and is held there by the biasing effect of the spring 50. It will be seen that as long as the spring F50 holds the sliding frame in its rearinost position, which occurs as long the projecting coil M is not magnetized, the push button Contact members cannot be closed.

inasmuch as the lay-passing action of car B stopped the operation of its zone feeding relays and the energization of the zone relays controlled thereby thus eliminating all zone action for car B and deenergized its floor button projecting coils BIUM etc., the floor button projecting coil BZUM for car B at the second fiom is deenergizcd and permits the sliding frame M (see 3) of that push button to resume its normal position by reason of the reaction ol' its biasing spring 5D. This action of the sliding frame il opens the contact members BlDJl and BlDJl! of the down button BEDJ at the second floor for car i3, thereby extinguishing the down iloor lantern BZDL at the second iioor for car B, deerA izing the .Floor button stopping contact segment Btg for car B, and doenergizing the iloor call registering coil BEDR.

'The 'by-passing action of car B in eliminating the zoning system for car B and making the zone for car A extend both up and down the shaft, also causes the cn-ergization of the floor button projecting coil EDM for the down floor button ZDJ for car A at the second rloor. The circuit for energizing the coil ."DM extends from the supply conductor L-l-I (Fig. 7) through the coil 2DM to the one side of the ring circuit ill! and thence through the closed conta-ct members QDZI, IUZI, ZUZI and SUZl, conductor and contact members EUYi to the supply conductor L-l. The energization of the coil EDM causes the slid ing frame All for the floor button EDM to move out wardly against the biasing effect of its spring 5E). Inasmuch as pusr button 'FDJ held in it; innermost position by the ener zed condition of its call registering coil 2DR, the outward morement of its sliding frame lll causes its contact members I and llDJii to close.

The closing ol the contact members ZDJI immediately lights the down floor lantern ZDL for n v un) car A at the second floor, thereby informing the waiting passenger at that floor that his call has been transferred to another car and also indicating the door at which the other car will stop so that the passenger may move to that door and be ready to board the car when it arrives and opens the door. The closing of the contact members 2DJ l also energizes the iioor button stopping contact segment 2g to cause car A to stop when it comes down to the second floor.

The closing of the contact members ZDJ?. completes a self-holding circuit for maintaining the floor call registering coil 2DR in an energize-d condition until the stop call is 4answered by car A.

In order that the down stop call at the second floor may be transferred from car B to 'car A by the transfer button B75, it is necessary to cause a delay in opening the contact members BDJl and B2DJ2 of the floor button BZDJ until the contact members 2DJ I and 2 of floor button 2DJ are closed, it being known that the deenergization of the floor button projecting coil BDM and the energization ci the iioor button projecting coil 2DM occur simultaneously. Therefore, in order to effect the transfer, it is necessary to maintain the push button Contact members B2DJ I and B2DJ2 in a closed condition until after the push button contact members DJ l and 2DJ2 are closed.

The delay in opening the contact members BZDJ l and BEDJZ is effected by placing a suitable damping means such as a copper band 'is upon the armature @d (Fig. 3) of the button BEDJ. When the projecting coil M is energized, the armature 64 is pulled in promptly and the band 'lil has no effect upon its action. However, when the projecting coil is deenergised, the band il delays the inner movement of the sliding ira-me fifi for a period of time suiiicient to permit the armature of the push button ZDJ to move its sliding frame outwardly and close the Contact members 211i! and 2DJ2, before the contact members BDJE and BEDJZ open.

rl'his period of time delay is very shortjust long enough to permit the operation of one projecting coll before the other is deenergized. Thus the action may be said to take place immediately.

It will be assumed now that the attendant in car B keeps that car moving until it reaches the lower terminal where it is stopped by the usual limit switches. The limit switch BDLS is also operated by the approach of car B to its lower terminal to deenergize the down direction preference relay BX, which in turn, closes its Contact members BXl, thereby energizing the up direction preference relay BW and also the electromagnet B l 3. The deenergization of the relay and the energization of the relay BW first opens the contact members BXL. and then closes the Contact members BW@ in the circuit of the 'car button holding coils for car B (Fig. 9) thereby deenergizing and again energizing the holding coils BCC, BSC'C and BiCC for the up trip. The energization of the electromagnet B273 tilts the floor selector arm BSM to engage the up brushes with the up Contact segments for car B.

It will also be assumed that the attendant in car B releases the icy-pass button Bl when the car reaches the lower terminal and thereby deonergizes the by-pass relay BN which closes its contact members BNi and BN? to restore the zoning system and the floor button stopping system for car B.

With car B at the lower terminal ready for an up trip, its zone feed brush B33 is disposed on the contact segment Bld, thereby energizing its zone feed relay BiUY. The energization of the relay BEUY closes its contact members BlUYZ to feed the ring zone circuit B and closes its contact members BlUYl to cnergizethe zone relay IUZ (Fig. S) which in turn opens its contact members EUZI in the ring circuit ill) and its contact members iUZZ in the ring circuit BBD.

inasmuch as car A is still standing at the third hoor on up its zone fee-d brush 33 is disposed on the contact segment 3d thereby energizing its zone feed relay BUY (Fig. 7). The energization oi relay BUY closes its contact members iiUYi to feed the zone ring circuit 30 and closes its contact members SUYE to energize the zone relay iUZ, which in turn opens its contact members SUZi in the ring circuit 8@ and its Contact members SUE? in the ring circuit Bil.

Referring to the ring circuit its active portion extends from the open contact members 3UZI through the contact members l'lUZI, SDZI, 4DZI, BDZ! and ZDZ! to the open contact members EUZ! and is fed by the closed contact members SUYI in conductor 85. Consequently, the floor button projecting coils AUM, 5DM, 4DM, 3DM, EDM and lUM are energized and project the floor push buttons llUJ, EDJ, llDJ, 3DJ, 2DJ and lDJ for car A, thus indicating that the zone of car A includes its up button at the fourth floor, its down buttons at the fifth, fourth, third and second oors and its up button at the first floor.

Inasrnuch as the projecting coils ZUM and SUM for car A are connected to the dead portion of the ring circuit 8U, they are not energized to project the up iioor buttons 2UJ and 3UJ for car A.

Referring to the zone ring circut BSU for car B (Fig. 9), its active portion extends from the open-contact members IUZZ through the contact members 2UZ'?. to the open contact members SUZ and is fed by the closed contact members BQDYZ in the conductor 86. This active portion of the ring circuit BBE! has connected to it the oor button projecting coils BUM and BSUM which are energized thereby to project the up floor buttons BZUJ and BSUJ at the second and third floors for car B.

inasmuch as the projecting coils BiiUM, BEDM, Bil-DM, BlDli/l, BDM and BlUM for car B are connected to the dead portion of the ring circuit Bilt, they are not energized to project the up floor buttons BlUJ and BfiUJ and the down floor buttons BiiDJ, BlDJ, BSDJ and BZDJ for car B. Thus, it is seen that one zone is provided for car A and the other zone for car B, indicating at the Various floors which push button should be operated by the waiting passengers to stop the next approaching car for their direction.

While car B stands at the lower terminal ready for an up trip, its floor lantern DiUL is lighted by a circuit (Fig. 9) extending from the supply conductor L-i-S through the contact members BVS, brush B32, Contact segment Blc and the floor lantern BlUL to the supply conductor L-6.

It will be assumed that the attendant on car A now standing at the third floor closes the elevator door and presses the button UP to cause the car to travel upwardly to the upper terminal. The operation of the starting button UP energizes the up direction switch U, which in turn effects the energization of the auxiliary generator field winding 23, the brake magnet E, the inductor restoring relay 'H and the high speed relay V to start the car upwardly in the same manner as described in starting it from the iirst oor.

It will be assumed also that car A runs to the upper terminal and is stopped by the usual limit switch etc. (not shown).

As car A stops at the upper terminal, the up limit switch ULS (Fig. 7) is operated to open position thereby deenergizing up direction preference relay W, which in turn closes its Contact members WI to thereby energize the down direction relay X in preparation for the down trip. The circuit for the down relay X extends from the supply conductor L+I through the contact members UP2, the coil X, the contact members Wl and the limit switch DLS to the supply conductor L-I.

The opening of the contact members W2 on the deenergized down relay W opens the circuit for the holding coil ZCC, 3CC and ICC and thereby causes them to release the car button 3C which has been pressed by the car attendant to effect the stopping of the car at the third floor on its up trip. The closing of the Contact members X2 in the circuit of the car button holding coils again energizes these coils to hold or register any stop calls on the car stop buttons during the down trip.

The energization of the down direction preference relay X also causes the energization of the electromagnet I4 (which is in parallel with the coil X) to tilt over the floor selector arm SM until its down contact brushes are in position to engage its down contact segments.

When car A comes to and stops at the upper terminal, its Iloor lantern 5DL at that iioor is lighted (Fig. 7) because its floor lantern brush 31 is in engagement with the contact segment 5h and its high speed relay contact members V2 are closed. This circuit extends from the supply conductor L-|-2, through the contact members V2, brush 31, contact segment 5h, and the. lantern 5DL to the supply conductor L-2.

As car A moved to and stopped at the upper terminal, the zone feeding relay brush 33 moved upwardly along the up zone feed relay contact segments 3d and 4d, and, by the action of the electromagnet I4, the floor selector was then tilted to cause the zone feed relay brush 38 to engage the down zone feed relay contact segment 5i. In this position the brush 38 and the contact segment 5i cooperate to energize the zone feed relay to close its contact members SDYI to feed the zone ring circuit (Fig. 7) and also to close its contact members 5DY2 to energize the zone relay 5DZ (Fig. 8).

The energization of the zone relay 5DZ opens contact members 5DZI in the ring circuit 80 and 5DZ2 in the ring circuit B80. The active portion in the circuit B0 is now fed by the closed contact members 5D! and extends from the open contact members 5DZI through the closed contact members QDZI, 3DZI and 2DZI to the open contact members IUZI. The projecting coils IUM, 2DM, 3DM and 4DM are thus energized to project the corresponding push buttons IUJ, 3DJ and 4DJ for car A, thus defining the zone for the iioor buttons of car A as extending from the upper terminal to the lower terminal.

It is to be noted that, inasmuch as the floor button registering coil 2DR on the down button 2DJ at the second oor for car A was energized by a self-holding circuit at the time the call was transferred, that button is held in its depressed position as shown in Fig. 6 and does not project and also causes the down floor lantern ZDL at the second iioor for car A to remain lighted to indicate that the car will make the next down stop. Therefore, the Waiting passenger at the second floor does not need any projecting button and is informed which car will carry him down- Wardly.

Inasmuch as car B still remains the lower terminal, the active portion of the ring circuit Bti-J fed by the closed Contact members BiUYZ extends from open Contact members iUZZ through the closed contact members ZUZIZ, BUZZ, li-UZE and up to the open contact members 5.1322. The floor button projecting coils BQUM, BBUM, B/IUM and BEDM are connected to this active portion of the ring circuit and therefore the up iioor button calls BZUJ, ESUJ, and BHZUJ and the down floor button BMDJ for ear i3, are projected at the second, third, fourth and rif th floors to indicate that they should be to stop the next approaching car on an up trip.

It will be assumed now that the attendant on car A starts that car on its down trip by cios-ing the doo-r by pressing the down starting button DP to energize the down direction switch by a circuit extending from the supply conductor L+I (Fig. '7) through the contact members DFI of the starting button DP, the coil D and the con tact members 1f-l, Fl and 13 to the supply con ductor L- l.

The energization of the down direction switch D closes its contact member D4 to establish a scif-holding circuit for itself, closes its Contact members Di and D?! to energize the auxiliary field winding 23 and closes its contact members D3 to energize the brake magnet The energizeticn of the auxiliary field winding 23 and the brake magnet 6 starts the hoisting motor IB and releases the brake 5, thereby moving the car A downwardly.

The closing of the Contact members D3 of the switch D also energizes the inductor restoring relay H to close its Contact members Hi, thereby preparing the inductor relays for operation when it is necessary to again stop car A.

The closing of 'the Contact members DE of the switch D energizes 'the high speed reiay V to close its contact members Vl, thereby circuiting the resistor' MR in the auxiiiary field winding 23 and thus operating the car downwardly at its normal high speed.

As car A leaves the fifth i'loor, the energzation of the high speed relay V opens its Contact members V2 in the circuit leading to the brush 31 and thereby extinguishes the down lamp SDL for car A at the fifth floor.

As car A continues downwardly to within a predetermined distance of the second floor, the floor button stopping brush 35 engages the con* tact segment 2g energized as the resuit of tho registered down stop call at the second iioor and thereby causes the energization oi the floor button stopping relay T for car A.

The energization of the reiay T closes its contact members Tl, thereby energizing the decelerating inductor relay E and the inductor holding relay G by a circuit extending from line concluetor L-i-l (Fig. 7) through the coils G and E in parallel 'thence through the Contact members Ti and H! to the supply conductor L-Z.

The energized relay G' closes its contact mei1 bers GI thus providing a hoiding circuit for the inductor relays.

As the car approaches still closer to the second floor, the energized decelerating relay E co'l opposite the down high speed inductor plate DE (Fig. l) and is thereby operated to open its contact members E2 which deenergizes the high 

